20 FUN~~~~

1.(p² +2p)－（９－２ｐ²）－（６ｐ＋２)
= p^2 + 2p - 9 + 2p^2 - 6p - 2
= 3p^2 - 4p -11//

２．（７ｘ－５ｙ＋１１）－（２ｘ＋５ｙ－１３）
= 7x - 5y + 11 - 2x - 5y +13
= 5x - 10y + 24//

３．（２ａ＋２ｂ）＋（７＋６ａ）＋（６Ｂ－１７）
= 2a + 2b + 7 + 6a + 6b - 17
= 8a + 8b - 10//

４．（１２Ｋ－３）－（８Ｋ＋２）－６Ｋ
= 12k - 3 - 8k - 2 - 6k
= -2k - 5//

５．４ａ－〔１３＋（５ａ－９）〕
= 4a - 13 - 5a + 9
= -a - 4//

６．８ｘ－〔２ｙ－（６ｘ＋８）〕
= 8x - 2y + 6x + 8
= 14x - 2y + 8//

７．（６ａ³－ｂ－１２）－（３ｂ²＋４）＋（４ａ³－２ｂ）
= 6a^3 - b - 12 - 3b^2 - 4 + 4a^3 - 2b
= 10a^3 - 3b^2 - 3b - 16//

８．－（３ｂ³＋３ａ）－（９ａ＋２ｂ³－３）
= - 3b^3 - 3a - 9a - 2b^3 + 3
= -5b^3 - 12a + 3//

1.(p^2+2p)-(9-2p^2)-(6p+2)
=p^2+2p-9+2p^2-6p-2
=3p^2-4p-11

2.(7x-5y+11)-(2x+5y-13)
=7x-5y+11-2x-5y+13
=5x-10y+24

3.(2a+2b)+(7+6a)+(6b-17)
=2a+2b+7+6a+6b-17
=8a+8b-10
=2(4a+4b-5)

4.．（１２Ｋ－３）－（８Ｋ＋２）－６Ｋ
=12k-3-8k-2-6k
=-2k-2
=-2(k+1)

5.4a-[13+(5a-9)]
=4a-[13+5a-9]
=4a-[4+5a]
=4a-4-5a
=-a-4

6.8x-[2y(6x+8)]
=8x-[2y-6x-8]
=8x-2y+6x+8
=14x-2y+8
=2(7x-y+4)

7.(6a^3-b-12)-(3b^2+4)+(4a^3-2b)
=6a^3-b-12-3b^2-4+4a^3-2b
=2a^3-3b^2-3b-16

8.-(3b^3+3a)-(9a+2b^3-3)
=-3b^3-3a-9a-2b^3+3
=-5b^3-12a+3

1. p2 + 2p - 9 + 2p2 - 6p - 2
= 3p2 - 4p -11

2. 7x - 5y + 11 + 2x - 5y + 13
= 9x - 10y +24

3. 2a + 2b + 7 + 6a + 6B - 17
= 8a + 2b - 10 + 6B

4. 12K - 3 - 8K - 2 - 6K
= -2K - 5

5. 4a - 13 - (5a - 9)
= 4a - 13 - 5a + 9
= -a - 4

6. 8x - 2y + (6x + 8)
= 8x - 2y + 6x + 8
= 14x - 2y + 8

7. 6a3 - b - 12 - 3b2 - 4 + 4a3 - 2b
= 10a3 - 3b2 - 3b - 16

8. -3b3 - 3a - 9a - 2b3 + 3
= -5b3 - 12a +3

1. p2 + 2p - 9 + 2p2 - 6p - 2
= 3p2 - 4p -11

2. 7x - 5y + 11 + 2x - 5y + 13
= 9x - 10y +24

3. 2a + 2b + 7 + 6a + 6B - 17
= 8a + 2b - 10 + 6B

4. 12K - 3 - 8K - 2 - 6K
= -2K - 5

5. 4a - 13 - (5a - 9)
= 4a - 13 - 5a + 9
= -a - 4

6. 8x - 2y + (6x + 8)
= 8x - 2y + 6x + 8
= 14x - 2y + 8

7. 6a3 - b - 12 - 3b2 - 4 + 4a3 - 2b
= 10a3 - 3b2 - 3b - 16

8. -3b3 - 3a - 9a - 2b3 + 3 = -5b3 - 12a +3

1.(p²+2p)-(9-2p²)-(6p+2)

=p²+2p-9+2p²-6p-2

=p²+2p²-11-4p

=3p²-11-4p...............finish